(주산no.16)*50만들기* 십의자리 덧셈

2021 3:17
Synopsis
십의자리+십의자리=50만들기] 십의자리의 이중덧셈하기. 33+19를 할때, 33에서 10을 더하고 다시 9를 더할때, 일의자리에 더할수 ...
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